1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecba301ec182c705a65cd53fab2a24516ddbbfde8b333cee76a4c531a0520c8. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc76143a-3ffa-499e-870c-cb02a94db816.json and https://artists.proofprofile.net/proofs/artist/dc76143a-3ffa-499e-870c-cb02a94db816.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb0454c2968791c8543ab9c0246d1fb3bca131610088f33d3e693ed5582051c. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACY1782960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5585701a387924699b6f141410e865bd3afcc74328889be9f87fb57d65cc20de. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACY1782963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46cfcd305b649749031757f60533cd25b5f9eb57f969a6270cc84e0dc90e4d2. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54407b7b6074463fde322a162ccb54de1d3b99d7728404913f09d2cb0b7e0784. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:53:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cd927c7d9d2048dbdd390a3075225e2b9d3ad8a056c3c6aef48574785227ff. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4bd213ee635ed7ba620cada4c2850b740727f7f516e47b005dce0a0859566a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ddc17c9909d7ad8dba0913dfb0b3daf5b836232244c8479990bb0e03893fb2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8910caabebbfc8ac534a64b33e40de624dd0ac0a1410bd7b0a4b271639275d8e. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T16:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec4166c7e97ddabd448b43cc9bfe21c58141222217074d241b59f6ca1b91fd0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b332961d7fa43107f51de332f2e16289eec5adf1ad2cce3fd10d8eeb4f3d869. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf3d3fe692f0a3a328d594c4756f919badb6ac176bc3f18cdaadef070cef86a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfddb722f26b4b51d83df365f11fd73bc27b3938d1e57d867ad5ba5292b9eb08b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US33R2200011.